How to Strengthen Hamstrings for Running

Strengthening your hamstrings for running means training them eccentrically—their ability to lengthen under load—not just building raw strength. Nordic curls and Romanian deadlifts are the two exercises with the most evidence behind them, and progressing gradually over 6-8 weeks is what makes the difference between building resilience and provoking a strain.

Why Do Hamstrings Get Strained During Running?

The hamstrings work hardest in two phases of the running gait: late swing and early stance. In late swing, as your leg swings forward and the foot is about to strike the ground, the hamstrings contract eccentrically to decelerate the shin and control knee extension. This is the point of highest strain risk—the muscle is lengthening while under tension, similar to the mechanism seen in sprinting injuries. In early stance, the hamstrings help extend the hip and stabilize the pelvis as your body moves over the planted foot.

Hamstring strains are among the more common running-related muscle injuries, particularly in runners who increase speed or hill volume quickly. They tend to occur in the muscle belly or near the myotendinous junction, and mild strains can linger for weeks if loaded again too soon.

What Exercises Best Strengthen Hamstrings for Running?

Two exercises stand out because they train the muscle through the lengthened range where running strains actually happen:

Nordic hamstring curls: Kneeling with your ankles anchored, you lower your torso toward the floor under control, resisting with your hamstrings, then use your hands to push back up. This is almost entirely eccentric loading in a lengthened hip position, which mirrors late-swing mechanics closely.

Romanian deadlifts (RDLs): Holding a barbell or dumbbells, you hinge at the hips with a soft knee bend, lowering the weight while keeping your back neutral, then driving your hips forward to stand. RDLs load the hamstrings and glutes together through hip extension, which is more specific to stance-phase demands.

A basic weekly template for a runner without current symptoms:

How Does Eccentric Strength Prevent Hamstring Injuries?

Eccentric training builds the muscle's capacity to absorb force while lengthening, which is precisely the load pattern implicated in most running-related hamstring strains. The Nordic hamstring exercise has the strongest research base here: in a widely cited randomized trial published in the British Journal of Sports Medicine, teams that performed a Nordic curl program saw hamstring injury rates drop markedly compared with teams that did not, and subsequent meta-analyses in soccer and field-sport populations have found reductions in the range of 50% or more. Most of this evidence comes from field-sport athletes rather than distance runners specifically, so the exact size of the effect for runners is less certain—but the underlying mechanism (better tolerance for eccentric, lengthened-state loading) applies to running gait as well.

It's worth being direct about the limits of this evidence: no exercise program eliminates injury risk, and factors like training load spikes, prior injury history, and overall fatigue matter alongside strength.

How Should You Progress Hamstring Strength Training?

Progress load and range gradually. Jumping straight into full-range Nordic curls is a common way to cause the soreness you were trying to avoid. A general progression looks like this:

Week Nordic Curl Progression Romanian Deadlift Progression Volume Guidance
1-2 Partial range, assisted with hands, 2×3-5 Bodyweight or light dumbbells, 2×8 Focus on form, not fatigue
3-4 Increase range, 2×5-6 Moderate load, 3×6-8 Add one extra set if no soreness beyond 48 hrs
5-6 Slower eccentric tempo (3-4 sec lower), 3×4-6 Progress load 5-10% Monitor hamstring tightness day after sessions
7-8 Near full range, 3×5-8 Continue progressive overload Maintain 1-2x/week long-term

If you feel sharp pain, a pulling sensation, or next-day tightness that doesn't ease within 48 hours, back off the range or load before continuing. Strength work should build capacity, not create new soreness that interferes with your running schedule.

What Else Supports Hamstring Health Beyond Direct Strength Work?

Hamstring strain risk isn't isolated to the muscle itself. Limited hip extension mobility can force the hamstrings to work harder to generate stride length, so pairing strength work with hip mobility exercises is a reasonable complement. Ankle stiffness changes how force transfers up the chain during stance, which is one reason some runners work on ankle mobility for running alongside hamstring and calf work. Calf strength also matters because a weak lower leg can shift more deceleration load onto the hamstrings during late swing—calf raises for runners are a useful addition to a posterior-chain strength routine.

If you're also dealing with joint noise elsewhere, like popping or cracking around the knee, that's frequently unrelated to hamstring strength and often harmless on its own—see is it normal for knees to crack when running for more on when that warrants attention versus when it doesn't.

Stride mechanics play a role too. Overstriding—landing with the foot well ahead of the hip—increases the deceleration demand on the hamstrings at initial contact. A cadence check using a phone-video tool like StrideIQ can flag whether your step rate suggests overstriding, though it won't tell you anything about hamstring strength or muscle activation directly; it's a form-pattern check, not a strength assessment.

What Can Strength Training Not Tell You About Your Injury Risk?

Strength exercises and video form checks have real limits. Neither can diagnose a current strain, tell you the exact tissue involved, or predict with certainty whether you're about to get injured. Research on hamstring injury prevention is strongest in field-sport athletes performing repeated sprints and cutting movements; the evidence base specific to distance runners is thinner, so treat the Nordic curl's injury-reduction numbers as a reasonable analogy rather than a guarantee for running.

If you have a hamstring that's currently sore, tight, or painful during or after runs, this article isn't a treatment plan. See a physiotherapist or sports medicine physician for an individualized assessment—they can test strength asymmetries, check for structural issues, and build a return-to-run plan matched to the actual injury. Self-directed strength work is reasonable for prevention in an uninjured runner, but it's not a substitute for in-person evaluation once symptoms are present.

Frequently Asked Questions

How often should runners do Nordic curls?

Two sessions per week is a common starting frequency, beginning with 2 sets of 3-5 partial-range reps and progressing range and tempo over 6-8 weeks. More isn't automatically better—recovery between sessions matters for adaptation.

Are Romanian deadlifts or Nordic curls better for runners?

They target different phases of the gait cycle: Nordic curls emphasize late-swing deceleration mechanics, while RDLs emphasize hip extension used in stance. Most runners benefit from including both rather than choosing one.

Can hamstring strength training fully prevent strains?

No. It can meaningfully reduce risk, particularly through eccentric work like Nordic curls, but training load spikes, fatigue, and prior injury history also contribute to strain risk. No program eliminates it entirely.

How do I know if I'm progressing hamstring exercises too fast?

Watch for soreness or tightness that persists beyond 48 hours, or any sharp pulling pain during the exercise. Either signal means you should reduce range, load, or tempo before continuing to progress.

When should I see a professional about hamstring pain?

If you have current pain, a pulling sensation while running, or soreness that doesn't resolve within a couple of days, see a physiotherapist or sports medicine physician for assessment before continuing to load the area on your own.

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